Check-valve



(No Model.)

'0. B.'DUDLEY 8v J. D. BOWMAN.

CHECK VALVE.

' Ju B mm i ahesr l i A 2 nven'ors:

' UNITED STATES l'PATENT OFFICE...

CHARLES B. DUDLEY AND JOHN D. BOWMAN, OF ALTOONA, PENNSYLVANIA.

CHECK-VALVE.

SPECIFICATION forming part of Letters Patent No. 405,250, dated June 18,1889. Application filed November 13, 1888. Serial No. 290,689. (Nomodel.)

.To @ZZ whom it may concern/.-

Be it known that we, CHARLES B. DUDLEY and JOHN D. BOWMAN, both ofAltoona, county of Blair, State of Pennsylvania, have invented a new anduseful Improved Check- Valve, of which the following is a true and exactdescription, reference being had to the accompanying drawings, whichform a part of this specification.

Our invention relates to the construction of a check-valve primarilydesigned for use in connection with the air-brake system of arailway-train; and we have especially designed it for use in theconnecting-pipe leading from the air-brake system proper to acarbureting system, through which the compressed air, after beingimpregnated with hydrocarbon vapor, is led to the burners within the carand utilized for lighting it.

The object of our invention is to obtain a check-valve which shall beboth sensitive in the sense that it will act promptly in cutting off areflux action of the air or gasand at the same time be so firmly seatedas to greatly diminish the chances of gas escaping backward through theseated valve.

A further object which we have in view is to combine with thecheck-valve a dnstguard, which will prevent any dust from the air-brakesystemfrom passing between the check-valve-a point of great importancewhere the air is used in carbureting system.

Reference being now had to the drawings which illustrate a valve,constructed in accordance with our invention and in what we believe tobe the best method devised by us for this application, Figure 1 is acentral sectional elevation of such a valve; and Fig. 2, a plan viewthereof, partly in section, on the line a: of Fig. l.

A A are respectively the entrance and exit pipes through which the airor gas passes to and from our improved check-valve.

B is a casting constituting the main part of the valve-chamber; C, acasting adapted to be secured by bolts L L, 85o., to the under side ofcasting B, and constituting a part of the valve-chamber. The thirdcasting J is provided to complete the valve-chamber, this casting Jbeing essentially a cap made removable to permit of the insertion andwithdrawal of the check-valve itself.

B', B0, and B9 are chambers formed in the casting B.

B2 is a passage leading from the chamber B to a passage C,which, througha continuation 02, leads to the chamber C2, formed in the casting C.

B4 and B3 B3 are respectively an annular flange and cross flanges orwebs formed on the bottom of casting B, as shown, so as to come abovethe chamber' C2 when the castings C and B are secured together.

B10 is a passage connecting with the open spaces lying between webs B2and with the chamber O2, through the perforated plate G and felt washerF. At its upper end this passage B10 leads into chamber B0. A

B5 is an annular flange or project-ion surrounding the passage B10, andextending up into chamber B6 above the bottom thereof, marked B11, whichserves, when protected by a leather washer, as the seat for thecheckvalve.

B7 is an annular groove formed in the bottom of chamber B0 below andloutside ofthe portion B11, on which the valveis seated.

C is a passage formed in casting C adapted to register, as shown, withthe passage B2 of casting B; C2, a passage leading from passage C to themain chamber C2, formed in casting C.'

C4 is a -central stud or support projecting upward through the chamberC3 to the same level as that of the annular groove, marked C5 in thedrawings.

D is a threaded pipe adapted to be screwed into the passage B2 and toproject into the passage C', as shown, when the castings B and C aresecured together. It serves the purpose of insuring the correctalignment lof the two passages, and is besides a convenient de vice forregulating the size of the passage.

E is a washer inserted between the'castings B and C to aid in making atight v joint between them.

F is a washer or a disk, of felt or some other material permeable toair, but which will prel vent the passage of dust. ,l Y,

G is a metal plate of similar size to the washer F and perforated withnumerous holes, as shown.

II is a washer, of leather or some similar material, which rests on theseat B11 and extends over the annular groove B7.

I is the check-valve, formed, as shown, so as to extend over the annularprojection B5 and seat itself on the leather washer II over thevalve-seat B11 at the bottom of chamber BG.

t' indicates annular serrations formed in the seat of valve I. Iindicates the stem of valve I; J, a cap arranged to screw into thecasting B and form a cover for the chamber Bf.

J is a projecting hollow boss formed in cap .I and serving as a guidetothe spindle I of valve I, and also serving to seat and center the springK, arranged to holdthe valve I to its seat.

J 2 is a passage connecting the top of the hollow boss J with thechamber B"'.

B8 is a passage leading from chamber B to chamber B.

The way in which the above-described device is put together is apparentfrom the drawings. In use the air (or it may be other gas) passes fromthe pipe A to the chamber B', thence through passages B2, C', and()2 tothe chamber C3. From this chamber it passes through the felt disk F andthe perforated metal disk G, which form a diaphragm between t-hechambers() and the continuation of this chamber formed by the rim andflanges B4 B3B3 of casting B. Having traversed this diaphragm and beenfreed from dust in so doing, the air enters the passage B10 and pressesupward against the check-valve, raising it from its seat and escapinginto the chamber B6, from whence it passes through passage Bs to chamberB9, and thence through pipe A to the point of use or storage. Wheneverthe pressure in chamber B9 exceeds that in chamber B', or approaches itwithin a predetermined amount regulated by the strength of the spring K,the valve I seats itself on the leather washer H and prevents refluxaction.

It has been found very difiicult in valves of this kind to prevent thegas or air from escaping backward even when the valve is seated, and toovercome this difficulty we have devised the peculiar seat and formationof the valve already described. Before placing the Valve I in thechamber BG we pour into the bottom of chamber B a mixture of glycerineand water, or some similar liquid which will evaporate slowly or not atall, and then place the leather washer H in position. The quantity ofglyecrine mixture or otherliquid should be sufficient to saturate thewasher II and fill the annular groove B7, over the top of which theouter portions of the washer l-I extend. In this way we insure that theleather washer II shall always be soft and saturated with the mixture.By using in connection with this saturated washer a valve provided withthe serrated bearing-face (such as is indicated at t) we insure theperfect closing of the passage governed by the valve even where thepressure holding the valve to its sel t is very light. Y

The particular formation a-nd arrangement of the passages leading to andfrom our improved check-valve are not material to our invention, theseshown being designed for the conjoint use of the dust-guard andcheckvalve, as shown in the drawings, and above described.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent, is

l. In combination with an air or gas conduit, a check-valve chamberhaving its entrance-passage situated in its bottom and surrounded by anupwardly-extending annular projection, so as to form an annular chamberte contain liquid, a valve-seat formed on the bottom of said chamberaround the upwardlyextending ange, a washer of leather or similarmaterial resting on said seat, and a valve shaped to extend over theannular projection and seat itself on the washer aforesaid, allsubstantially as and for the purpose speciiied.

2. In combination with an air or gas conduit, a check-valve chamberhavingits entrance-passage situated in its bottom and surrounded by anupwardly-extending annular projection, so as to form an annular chamberto contain liquid, a valve-seat formedenthe bottom of said chamberaround the upwardlyextending flange, an annular groove extending aroundand below the valve-seat, a washer of leather or similar materialrestingon said seat and extending over the annular depressed groove, anda valve shaped to extend over the annular projection and seat itself onthe washer aforesaid, all substantiallyas and for the purpose specified,

3. In combination with an air or gas conduit, a check-valve chamberhaving its en trance-passage;situated in its bottom and surrounded by anupwardly-extending annu lar projection, so as to form an annular chamber to contain liquid, a Valve-seat formed on the bottom of said chamberaround the upwardly-extending iiange, a washer of leather or similarmaterial resting on said seat, and a valve shaped to extend over theannular projection and seat itself on the washer aforesaid, said valvehaving a bearing-face provided with scrrations, all substantially as andfor the purpose specified.

et. In combination with an air or gas conduit, a check-valve chamberhaving its entrance-passage situated `in its bottom and surrounded by anupwardly-extendin g annular projection, so as to form an annular chamberto contain liquid, a valve-seat formed on the bottom of said chamberaround the upwardlyextending flange, an annular groove extending aroundand below the valve-seat, a washer of leather or similar materialresting on said seat and extending over the annular depressed grooves,and a valve shaped to extend over the annular projection and seat IOCITO

itself on the washer aforesaid, said valve having a bearing-faceprovided with serrations, all substantially as and for the purposespecified.

5. In combination with an air or gas conduit, a dust-guard consisting ofa disk or washer of felt and a similar disk of perforated metal arrangedto support the felt secured across the conduit, and a check-valvesituated in the conduit on the exit side of the dust-guard.

6. In 'combination with an air or gas conduit, a valve-chamber castingB, containing chambers B', B6, and B6 and having below chamber B6 anannular flange B4 and webs B6, a casting C, containing a chamber C6, andhaving an annular groove C5 and a central support C4, passagesconnecting chamber C6 with chambers B and B6 and chamber B6 with B6, afelt washer G and perforated metal supporting-plate F, clamped betweenthe flange and webs B4 B3 B3 and the groove and support C5 C4, acheck-valve situated in chamber B6, and a cap J, forming a cover to saidchamber B6, all substantially as and for the purpose specified.

7. In combination with an air or gas conduit, a valve-chamber casting B,containing chambers B, B6, and B9 and having below chamber B6 an annulariiange B4 and webs B6, a casting C, containing a chamber C6 and havingan annular groove C5 and a central support O4, passages connectingchamber C6 with chambers B and B6 and chamber B6 with B6, a felt washerG and perforated metal supporting-plate F, clamped between the flangeand webs B4 B3 B3 and the groove and support C6 C4, an annularprojection B5, extending around the entrance of the passage connectingchamber C6with chamber B6, so as to form a chamber at the bottom ofchamber B6 to contain liquid, avalve-seat formed around ange B6, anannular depressed groove eX- tending around said valve-seat, a washer H,covering the valve-seat and extending over the depressed groove, a valveI, formed to eX- tend over the projection B6 and seat itself on WasherH, a valve-stem I extending up from said valve, a cap J, having a hollowinternal projection J to supportv and guide the stem I', and a passage J2, leading from chamber B6 to the top of the hollow projection, allsubstantially as and for the purpose speciiied.

CHARLES B. DUDLEY. JOHN D. BOWMAN. Witnesses:

J. L. RUssELL, J. CHESTER WILSON.

